A Tannin-based Inhibitive Pigment for a Sustainable Anti-corrosive Epoxy Coating Formulation

Zoi Lamprakou, Huichao Bi*, Claus Erik Weinell, Kim Dam-Johansen

*Corresponding author for this work

Research output: Contribution to conferenceConference abstract for conferenceResearchpeer-review

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Abstract

During the past years, tannins have been extensively used as corrosion inhibitors in boiler feed-water and water cooling systems to protect the internal parts of the equipment. Their inhibition action relies on the physical or chemical adsorption (depending on the environment) to the metal surface and the formation of a protective film. Tannins are considered one of the most abundant components extracted from natural resources, after cellulose, hemicelluloses, and lignin due to their high concentration in several plants.

The use of organic inhibitive pigments that can be extracted from natural resources has driven researchers’ attention recently. The substitution of the commercially available inorganic inhibitive pigments (e.g. zinc phosphate) by organic can provide with non-toxic, renewable, low cost and efficient raw materials the pigments industry [1], [2]. Tannin-based pigments are promising candidates in this direction. Tannate complexes have been synthesized from tannins and added to organic coatings. However, the research on the performance of tannate inhibitive pigments in organic coatings is still quite limited [3], [4].

The present work investigates the anti-corrosive performance of the calcium tannate complex into an epoxy coating system in comparison to the commercially available inhibitive pigments. Calcium tannate was synthesized, characterized and dispersed into the epoxy coating. Electrochemical Impedance Spectroscopy (EIS) and Scanning Acoustic Microscopy (SAM) were employed to monitor the anti-corrosive performance of the coating formulated with the as-prepared pigment after the exposure to the salt spray chamber. Reference coatings with the commercial zinc phosphate and calcium phosphate pigments were also evaluated for comparison reasons. The effective anti-corrosive properties of calcium tannate were successfully demonstrated by both EIS and SAM results.
Original languageEnglish
Publication date2021
Number of pages1
Publication statusPublished - 2021
EventEUROCORR 2021: European Corrosion Congress - Virtual, Budapest, Hungary
Duration: 20 Sep 202124 Sep 2021
Conference number: 447
https://eurocorr.org/

Conference

ConferenceEUROCORR 2021
Number447
LocationVirtual
Country/TerritoryHungary
CityBudapest
Period20/09/202124/09/2021
Internet address

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